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【判断题】
心肺复苏按压与呼吸比为15:1A.
正确
B.
错误
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举一反三
【单选题】The Corsi research team hypothesised that ______.
A.
toxic chemicals can pass from air to water.
B.
pollution is caused by dishwashers and baths.
C.
city water contains insufficient chlorine.
D.
household appliances are poorly designed
【单选题】下列关于构造方法的描述中,错误的是( )
A.
在Java中的每个类都至少有一个构造方法
B.
如果在一个类中没有定义构造方法，系统会自动为这个类创建一个默认的构造方法
C.
默认的构造方法没有参数，在其方法体中没有任何代码
D.
当类中显示定义了构造方法，系统也会为这个类创建一个默认的构造方法
【单选题】document.write("\" 复仇者 \" 联盟 "); 这一句代码的输出结果是
A.
复仇者联盟
B.
" 复仇者 " 联盟
C.
\" 复仇者 \" 联盟
D.
语法有误，程序报错
【单选题】In developed countries, before toxic chemicals are released into rivers and lakes, they should be treated in order to avoid ______.
A.
cleanness
B.
air pollution
C.
water pollution
D.
explosion
【单选题】Dafforn considers the discovery of the toxic chemicals in the trenches disturbing because _____.
A.
we are paying little attention to the impacts of sea exploration
B.
we can’t foresee how long the chemicals will influence our life
C.
we have no idea about the source of the high levels of toxic chemicals
D.
we don’t know completely what impacts the chemicals may bring to us
【单选题】The reader learns that toxic chemicals get into our food________. 查看材料
A.
when plastic becomes small enough to enter our food chain
B.
because other animals are being killed by plastic
C.
because plastic does not biodegrade
D.
from plastic bags from supermarkets
【判断题】Since many organic chemicals are toxic, the polymers made from them are also toxic.
A.
正确
B.
错误
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